Wavelength conversion filter module and illumination system
A wavelength conversion filter module and an illumination system are provided. The wavelength conversion filter module includes a carrier and a wavelength conversion filter unit. The wavelength conversion filter unit is located in a wavelength conversion filter region of the carrier, and the wavelength conversion filter unit includes a filter reflective device, a wavelength conversion device, and a first filter device disposed on the carrier in order. The first filter device is suitable for allowing the excitation beam to pass through. The wavelength conversion device is suitable for converting the excitation beam into a conversion beam. The conversion beam includes a specific color beam and a color beam other than the specific color beam. The filter reflective device is suitable for reflecting the specific color beam and absorbing the color beam other than the specific color beam. The reflected specific color beam passes through the first filter device.
Latest Coretronic Corporation Patents:
This application claims the priority benefit of China application serial no. 201710286495.2, filed on Apr. 27, 2017. The entirety of the above-mentioned patent application is hereby incorporated by reference herein and made a part of this specification.
BACKGROUND OF THE INVENTION Field of the InventionThe invention relates to an optical device and an optical system, and more particularly, to a wavelength conversion filter module and an illumination system.
Description of Related ArtIn recent years, a projection device based on a solid-state light source such as a light-emitting diode (LED) and a laser diode has gradually earned a place in the market. The laser diode has high luminous efficiency, and the laser beam emitted by the laser diode not only can be used to excite phosphor, but can be directly used as the illumination light source of the projection device, and the number of the laser diodes can be adjusted in correspondence to brightness requirements to meet various different brightness requirements of the projection device. Therefore, the projection device adopting a laser light source has very high potential to replace the traditional high-pressure mercury lamp to become the new generation of mainstream projection device.
In the current laser projection device, phosphor is mixed with silicone and then the mixture is coated on a high reflectivity substrate to form a phosphor wheel. The laser (such as blue light) emitted from the laser diode is focused on the phosphor wheel via an optical device. The phosphor in the phosphor wheel absorbs blue light and emits a specific color beam such as red light and green light. Since the current red light and green light emitted by the phosphor cannot achieve the desired color specification of the laser projection device, the current laser projection device requires a filter wheel synchronously rotating with the phosphor wheel to generate red light and green light that meet color specifications.
However, the filter wheel not only increases the cost of the illumination system, but also makes the design of the illumination system more complex. Since the beam emitted by the phosphor wheel is divergent, spoke light formed on the filter wheel is relatively divergent, i.e., the area of the spoke light formed on the filter wheel is greater. The spoke light having a large area may fall on two adjacent filter devices in the filter wheel such that color cast occurs to beams emitted from the filter wheel, and the color performance of the image projected by the laser projection device is affected as a result. Therefore, how to omit the filter wheel but achieve the desired color specification is an issue to be solved by those skilled in the art.
The information disclosed in this Background section is only for enhancement of understanding of the background of the described technology and therefore it may contain information that does not form the prior art that is already known to a person of ordinary skill in the art. Further, the information disclosed in the Background section does not mean that one or more problems to be resolved by one or more embodiments of the invention was acknowledged by a person of ordinary skill in the art.
SUMMARY OF THE INVENTIONThe wavelength conversion filter module provided by the invention can provide a specific color beam having high color purity.
The illumination system provided by the invention can omit a filter wheel but achieve the desired color specification.
Other objects and advantages of the invention can be further understood from the technical features disclosed in the invention.
To achieve one or some or all of the objects above or other objects, an embodiment of the invention provides a wavelength conversion filter module including a carrier and a wavelength conversion filter unit. The carrier has a plurality of optical regions and is adapted to move to allow the optical regions to receive an excitation beam in order. At least one of the optical regions is a wavelength conversion filter region. The wavelength conversion filter unit is located in the wavelength conversion filter region and includes a filter reflective device, a wavelength conversion device, and a first filter device disposed on the carrier in order. The first filter device is suitable for allowing the excitation beam incident on the wavelength conversion filter unit to pass through. The wavelength conversion device is suitable for converting the excitation beam into a conversion beam. The conversion beam includes a specific color beam and a color beam other than the specific color beam. The filter reflective device is suitable for reflecting the specific color beam and absorbing the color beam other than the specific color beam. The first filter device is suitable for allowing the specific color beam to pass through and reflecting a color beam other than the specific color beam and the excitation beam.
To achieve one or some or all of the objects above or other objects, an embodiment of the invention provides a wavelength conversion filter module including a carrier and a wavelength conversion filter unit. The carrier has a plurality of optical regions and is adapted to move to allow the optical regions to receive an excitation beam in order. At least one of the optical regions is a wavelength conversion filter region, and the carrier has an opening overlapped with the wavelength conversion filter region. The wavelength conversion filter unit is located in the wavelength conversion filter region and includes a second filter device, a wavelength conversion device, and a first filter device disposed on the carrier in order. The first filter device is suitable for allowing the excitation beam incident on the wavelength conversion filter unit to pass through. The wavelength conversion device is suitable for converting the excitation beam into a conversion beam. The conversion beam includes a specific color beam and a color beam other than the specific color beam. The second filter device is suitable for reflecting the specific color beam and allowing the color beam other than the specific color beam to pass through. The first filter device is suitable for allowing the specific color beam to pass through and reflecting a color beam other than the specific color beam and the excitation beam.
To achieve one or some or all of the objects above or other objects, an embodiment of the invention provides an illumination system including an excitation light source suitable for providing an excitation beam and any wavelength conversion filter module above. The wavelength conversion filter module is disposed on the transmission path of the excitation beam.
Based on the above, the embodiments of the invention have at least one of the following advantages or efficacies. In the wavelength conversion filter module of an embodiment of the invention, since the filter reflective device disposed below the wavelength conversion device can reflect the specific color beam in the conversion beam and absorb the color beam other than the specific color beam in the conversion beam, and the first filter device disposed on the wavelength conversion device can allow the specific color beam and the excitation beam to pass through and reflect the color beam other than the specific color beam and the excitation beam, the wavelength conversion filter module can provide the specific color beam having higher color purity, and the illumination system adopting the wavelength conversion filter module can omit the filter wheel but achieve the desired color specification. In the wavelength conversion filter module of another embodiment of the invention, since the second filter device disposed below the wavelength conversion device can reflect the specific color beam in the conversion beam and allow the color beam other than the specific color beam in the conversion beam to pass through, and the color beam other than the specific color beam is emitted from the wavelength conversion filter module via the opening of the carrier and can be filtered by a filter device disposed outside the wavelength conversion filter module or absorbed by a light absorbing device disposed outside the wavelength conversion filter module, and the first filter device disposed on the wavelength conversion device can allow the specific color beam and the excitation beam to pass through and reflect the color beam other than the specific color beam and the excitation beam, the wavelength conversion filter module can provide the specific color beam having higher color purity, and the illumination system adopting the wavelength conversion filter module can omit the filter wheel but achieve the desired color specification.
In order to make the aforementioned features and advantages of the disclosure more comprehensible, embodiments accompanied with figures are described in detail below.
Other objectives, features and advantages of the invention will be further understood from the further technological features disclosed by the embodiments of the invention wherein there are shown and described preferred embodiments of this invention, simply by way of illustration of modes best suited to carry out the invention.
The accompanying drawings are included to provide a further understanding of the invention, and are incorporated in and constitute a part of this specification. The drawings illustrate embodiments of the invention and, together with the description, serve to explain the principles of the invention.
In the following detailed description of the preferred embodiments, reference is made to the accompanying drawings which form a part hereof, and in which are shown by way of illustration specific embodiments in which the invention may be practiced. In this regard, directional terminology, such as “top,” “bottom,” “front,” “back,” etc., is used with reference to the orientation of the Figure(s) being described. The components of the invention can be positioned in a number of different orientations. As such, the directional terminology is used for purposes of illustration and is in no way limiting. On the other hand, the drawings are only schematic and the sizes of components may be exaggerated for clarity. It is to be understood that other embodiments may be utilized and structural changes may be made without departing from the scope of the invention. Also, it is to be understood that the phraseology and terminology used herein are for the purpose of description and should not be regarded as limiting. The use of “including,” “comprising,” or “having” and variations thereof herein is meant to encompass the items listed thereafter and equivalents thereof as well as additional items. Unless limited otherwise, the terms “connected,” “coupled,” and “mounted” and variations thereof herein are used broadly and encompass direct and indirect connections, couplings, and mountings. Similarly, the terms “facing,” “faces” and variations thereof herein are used broadly and encompass direct and indirect facing, and “adjacent to” and variations thereof herein are used broadly and encompass directly and indirectly “adjacent to”. Therefore, the description of “A” component facing “B” component herein may contain the situations that “A” component directly faces “B” component or one or more additional components are between “A” component and “B” component. Also, the description of “A” component “adjacent to” “B” component herein may contain the situations that “A” component is directly “adjacent to” “B” component or one or more additional components are between “A” component and “B” component. Accordingly, the drawings and descriptions will be regarded as illustrative in nature and not as restrictive.
Referring to
The carrier 110 has a plurality of optical regions R disposed adjacent to one another and is adapted to move to allow the optical regions R to receive an excitation beam from an excitation light source (not shown) in order. For instance, the shape of the carrier 110 can be substantially a circle or a ring having a rotation axis O. The optical regions R are disposed along the circumference of the carrier 110 to surround the rotation axis O, and when the carrier 110 rotates around the rotation axis O, the optical regions R can cut into the transmission path of the excitation beam in order.
At least one of the optical regions R is a wavelength conversion filter region. For instance, the optical regions R can include a wavelength conversion filter region RA and a wavelength conversion filter region RB. However, the quantity of the wavelength conversion filter region in the optical regions R can be changed as needed and is not limited thereto.
The quantity of the wavelength conversion filter unit 120 is equal to the quantity of the wavelength conversion filter region. As shown in
Referring to
In an embodiment in which the excitation beam B is a blue beam and the specific color beam B11 is a red beam, the wavelength conversion device 124 includes a phosphor that can emit yellow beam. The first filter device 126 is suitable for allowing blue beam and red beam to pass through and reflecting other color beams. The blue beam is incident on the wavelength conversion filter unit 120 from the first filter device 126. The wavelength conversion device 124 absorbs blue beam and emits yellow beam (such as the conversion beam B1), and the yellow beam includes red band beam (such as the specific color beam B11) and other band beams (such as the color beam B12 other than the specific color beam B11). A portion of the yellow beam spread to the surrounding is transmitted toward the filter reflective device 122, and another portion is transmitted toward the first filter device 126. The red band beam in the yellow beam transmitted toward the filter reflective device 122 is reflected by the filter reflective device 122, and the other band beams in the yellow beam are absorbed by the filter reflective device 122. The red band beam (such as the specific color beam B11) in the yellow beam transmitted toward the first filter device 126 is emitted from the first filter device 126, and other band beams (such as the color beam B12) in the yellow beam are reflected by the first filter device 126 and transmitted toward the filter reflective device 122 and absorbed by the filter reflective device 122. Moreover, a small amount of the beam passing through the filter reflective device 122 is reflected by the metal carrier 110. As a result, via the disposition of the filter reflective device 122 and the first filter device 126 of the wavelength conversion filter unit 120, the red beam emitted from the first filter device 126 can have higher color purity.
In an embodiment in which the excitation beam B is a blue beam and the specific color beam B11 is a green beam, the wavelength conversion device 124 includes a phosphor that can emit green beam. The first filter device 126 is suitable for allowing blue beam and green beam to pass through and reflecting other color beams. The wavelength conversion device 124 absorbs blue beam and emits green beam (such as the conversion beam B1). A portion of the green beam spread to the surrounding is transmitted toward the first filter device 126, and another portion is transmitted toward the filter reflective device 122. The green beam transmitted toward the first filter device 126 is emitted from the first filter device 126. The green beam transmitted toward the filter reflective device 122 is reflected by the filter reflective device 122 and changes direction, and is emitted from the first filter device 126 after passing through the wavelength conversion device 124 and the first filter device 126 in order. The filter reflective device 122 can be designed to reflect beams of a specific green band in the green light and absorb beams of reddish or bluish bands in the green light, and the first filter device 126 can also be designed to allow beams of a specific green band and the excitation beam B to pass through and reflect beams (such as beams of reddish or bluish bands in red beam and green beam) other than the beams of the specific green band and the excitation beam B. Moreover, a small amount of the beam passing through the filter reflective device 122 is reflected by the metal carrier 110. As a result, via the disposition of the filter reflective device 122 and the first filter device 126 of the wavelength conversion filter unit 120, the green beam emitted from the first filter device 126 can have higher color purity.
Referring to
The wavelength conversion device 124 can include one or a plurality of wavelength conversion layers.
More specifically, in
In an embodiment in which the excitation beam B is a blue beam and the specific color beam B11 is a red beam, the first wavelength conversion layer 124A includes a phosphor that can emit yellow beam, and the second wavelength conversion layer 124B includes a phosphor that can emit red beam. The phosphor that can emit red beam and the phosphor that can emit yellow beam have overlapped excitation spectrums, and the peak value of the excitation spectrum of the phosphor that can emit yellow beam is less than the peak value of the excitation spectrum of the phosphor that can emit red beam. The first filter device 126 is suitable for allowing blue beam and red beam to pass through and reflecting other color beams. The excitation beam B (blue beam) passes through the first filter device 126 and is transmitted to the first wavelength conversion layer 124A. The first wavelength conversion layer 124A absorbs blue beam and emits yellow beam (such as the conversion beam B1), and the yellow beam includes red band beam (such as the specific color beam B11) and other band beams (such as the color beam B12 other than the specific color beam B11). A portion of the yellow beam spread to the surrounding is transmitted toward the first filter device 126, and another portion is transmitted toward the second wavelength conversion layer 124B. The red band beam in the yellow beam transmitted toward the first filter device 126 is emitted from the first filter device 126, and other band beams in the yellow beam are reflected by the first filter device 126 and transmitted toward the second wavelength conversion layer 124B. The second wavelength conversion layer 124B absorbs the yellow beam passing through the first wavelength conversion layer 124A and a small amount of blue beam not converted by the first wavelength conversion layer 124A and emits red beam (such as the conversion beam B2). The red beam emitted by the second wavelength conversion layer 124B is spread to the surrounding. A portion of the red beam spread to the surrounding passes through the first wavelength conversion layer 124A and the first filter device 126 in order and is emitted from the first filter device 126. Another portion of the red beam spread to the surrounding is first reflected by the filter reflective device 122 and then passes through the second wavelength conversion layer 124B, the first wavelength conversion layer 124A, and the first filter device 126 in order, and is emitted from the first filter device 126. Moreover, a small amount of the beam passing through the filter reflective device 122 is reflected by the metal carrier 110.
Referring further to
The wavelength conversion filter module 100 can further include a wavelength conversion device 130 located in the wavelength conversion region RC. The wavelength conversion device 130 can include a phosphor that can emit yellow beam to convert an excitation beam incident on the wavelength conversion region RC into yellow beam. A portion of the yellow beam spread to the surrounding is directly emitted toward the direction away from the carrier 110, and another portion is transmitted toward the carrier 110 and reflected by the carrier 110 and changes direction, and is emitted toward the direction away from the carrier 110.
The light penetration region RD is suitable for allowing an excitation beam to pass through. As shown in
Referring to
Referring to
Referring to
The excitation light source 12 is a laser light source, and the excitation beam B is a laser beam. For instance, the excitation light source 12 can be a blue laser diode bank, and the excitation beam B can be a blue excitation beam, but the invention is not limited thereto. As shown in
The illumination system 10 can further include a beam splitter device 16, a plurality of reflectors 18, and a beam combiner device 19. The beam splitter device 16 is disposed on the transmission path of the excitation beam B, and the beam splitter device 16 is located between the excitation light source 12 and the wavelength conversion filter module 14. The beam splitter device 16 is suitable for allowing the excitation beam B (such as blue beam) to pass through and reflecting other color beams (such as red beam, green beam, and yellow beam). For instance, the beam splitter device 16 can be a dichroic mirror or dichroic prism, but is not limited thereto.
The wavelength conversion filter module 14 is disposed on the transmission path of the excitation beam B from the beam splitter device 16, wherein the wavelength conversion filter unit of the wavelength conversion filter module 14 is disposed on the surface of the carrier facing the beam splitter device 16, and the carrier is suitable for rotating around the rotation axis thereof such that the optical regions cut into the transmission path of the excitation beam B in order. In the case that the carrier rotates counterclockwise, the light penetration region RD, the wavelength conversion filter region RA, the wavelength conversion region RC, and the wavelength conversion filter region RB of the optical regions R in
Referring to
Based on different needs, the illumination system 10 can further include other devices such as a lens device (not labeled) located between the optical devices, integral columns located on the transmission path of the illumination beam IB and adjusting the optical shape of the illumination beam IB, a microdisplay (such as a digital micromirror device) that can provide a grayscale image, or a projection lens group.
Based on the above, the embodiments of the invention have at least one of the following advantages or efficacies. In the wavelength conversion filter module of an embodiment of the invention, since the filter reflective device disposed on the carrier can reflect the specific color beam of the conversion beam from the wavelength conversion device and absorb a color beam other than the specific color beam, and the first filter device disposed on the wavelength conversion device can allow the excitation beam and the specific color beam to pass through and reflect a color beam other than the specific color beam and the excitation beam, the wavelength conversion filter module can provide a specific color beam having higher color purity, and the illumination system adopting the wavelength conversion filter module can omit the filter wheel but achieve the desired color specification. In an embodiment, in addition to including the pigment of the specific color beam or the absorbent glass powder of the specific color beam, the filter reflective device can further include a high-reflectivity powder to further increase the reflectivity of the specific color beam and provide heat dissipation effect. In the wavelength conversion filter module of another embodiment of the invention, since the second filter device disposed below the wavelength conversion device can reflect the specific color beam of the conversion beam and allow the color beam other than the specific color beam to pass through, and the color beam other than the specific color beam is emitted from the wavelength conversion filter module via the opening of the carrier and can be filtered by a filter device disposed outside the wavelength conversion filter module or absorbed by a light absorbing device disposed outside the wavelength conversion filter module, and the first filter device disposed on the wavelength conversion device can allow the excitation beam and the specific color beam to pass through and reflect the color beam other than the specific color beam and the excitation beam, the wavelength conversion filter module can provide a specific color beam having higher color purity, and the illumination system adopting the wavelength conversion filter module can omit the filter wheel but achieve the desired color specification. Moreover, the opening of the carrier can reduce the accumulation of heat to increase heat dissipation effect.
The foregoing description of the preferred embodiments of the invention has been presented for purposes of illustration and description. It is not intended to be exhaustive or to limit the invention to the precise form or to exemplary embodiments disclosed. Accordingly, the foregoing description should be regarded as illustrative rather than restrictive. Obviously, many modifications and variations will be apparent to practitioners skilled in this art. The embodiments are chosen and described in order to best explain the principles of the invention and its best mode practical application, thereby to enable persons skilled in the art to understand the invention for various embodiments and with various modifications as are suited to the particular use or implementation contemplated. It is intended that the scope of the invention be defined by the claims appended hereto and their equivalents in which all terms are meant in their broadest reasonable sense unless otherwise indicated. Therefore, the term “the invention”, “the present invention” or the like does not necessarily limit the claim scope to a specific embodiment, and the reference to particularly preferred exemplary embodiments of the invention does not imply a limitation on the invention, and no such limitation is to be inferred. The invention is limited only by the spirit and scope of the appended claims. The abstract of the disclosure is provided to comply with the rules requiring an abstract, which will allow a searcher to quickly ascertain the subject matter of the technical disclosure of any patent issued from this disclosure. It is submitted with the understanding that it will not be used to interpret or limit the scope or meaning of the claims. Any advantages and benefits described may not apply to all embodiments of the invention. It should be appreciated that variations may be made in the embodiments described by persons skilled in the art without departing from the scope of the invention as defined by the following claims. Moreover, no element and component in the disclosure is intended to be dedicated to the public regardless of whether the element or component is explicitly recited in the following claims.
Claims
1. A wavelength conversion filter module, comprising:
- a carrier having a plurality of optical regions and adapted to move to allow the plurality of optical regions to receive an excitation beam in order, wherein at least one of the plurality of optical regions is a wavelength conversion filter region; and
- a wavelength conversion filter unit located in the wavelength conversion filter region and comprising a filter reflective device, a wavelength conversion device, and a first filter device disposed on the carrier in order, wherein the first filter device is suitable for allowing the excitation beam incident on the wavelength conversion filter unit to pass through, the wavelength conversion device is suitable for converting the excitation beam into a conversion beam, the conversion beam comprises a specific color beam and a color beam other than the specific color beam, the filter reflective device is suitable for reflecting the specific color beam and absorbing the color beam other than the specific color beam, and the first filter device is suitable for allowing the specific color beam to pass through and reflecting a color beam other than the specific color beam and the excitation beam.
2. The wavelength conversion filter module of claim 1, wherein the wavelength conversion device comprises one or a plurality of wavelength conversion layers, and the plurality of wavelength conversion layers have different or partially overlapped excitation spectrums.
3. The wavelength conversion filter module of claim 2, wherein the wavelength conversion device comprises a first wavelength conversion layer and a second wavelength conversion layer, the second wavelength conversion layer is located between the first wavelength conversion layer and the filter reflective device, and a peak value of the excitation spectrum of the first wavelength conversion layer is less than a peak value of the excitation spectrum of the second wavelength conversion layer.
4. The wavelength conversion filter module of claim 1, wherein the wavelength conversion filter unit further comprises:
- a second filter device disposed between the filter reflective device and the wavelength conversion device, wherein the second filter device is suitable for reflecting the specific color beam and allowing the color beam other than the specific color beam to pass through.
5. The wavelength conversion filter module of claim 1, wherein the filter reflective device comprises a reflective layer and a second filter device, the second filter device is disposed between the reflective layer and the wavelength conversion device, and the second filter device is suitable for reflecting the specific color beam and allowing the color beam other than the specific color beam to pass through.
6. The wavelength conversion filter module of claim 1, wherein the filter reflective device comprises a pigment corresponding to the specific color beam or an absorbent glass powder corresponding to the specific color beam.
7. A wavelength conversion filter module, comprising:
- a carrier having a plurality of optical regions and adapted to move to allow the plurality of optical regions to receive an excitation beam in order, wherein at least one of the plurality of optical regions is a wavelength conversion filter region, and the carrier has an opening overlapped with the wavelength conversion filter region; and
- a wavelength conversion filter unit located in the wavelength conversion filter region and comprising a second filter device, a wavelength conversion device, and a first filter device disposed on the carrier in order, wherein the first filter device is suitable for allowing the excitation beam incident on the wavelength conversion filter unit to pass through, the wavelength conversion device is suitable for converting the excitation beam into a conversion beam, the conversion beam comprises a specific color beam and a color beam other than the specific color beam, the second filter device is suitable for reflecting the specific color beam and allowing the color beam other than the specific color beam to pass through, and the first filter device is suitable for allowing the specific color beam to pass through and reflecting a color beam other than the specific color beam and the excitation beam.
8. The wavelength conversion filter module of claim 7, wherein the wavelength conversion device comprises one or a plurality of wavelength conversion layers, and the plurality of wavelength conversion layers have different or partially overlapped excitation spectrums.
9. The wavelength conversion filter module of claim 8, wherein the wavelength conversion device comprises a first wavelength conversion layer and a second wavelength conversion layer, the second wavelength conversion layer is located between the first wavelength conversion layer and the second filter device, and a peak value of the excitation spectrum of the first wavelength conversion layer is less than a peak value of the excitation spectrum of the second wavelength conversion layer.
10. An illumination system, comprising:
- an excitation light source adapted to provide an excitation beam; and
- a wavelength conversion filter module disposed on a transmission path of the excitation beam and comprising: a carrier having a plurality of optical regions and adapted to move to allow the plurality of optical regions to receive the excitation beam in order, wherein at least one of the plurality of optical regions is a wavelength conversion filter region; and a wavelength conversion filter unit located in the wavelength conversion filter region and comprising a filter reflective device, a wavelength conversion device, and a first filter device disposed on the carrier in order, wherein the first filter device is suitable for allowing the excitation beam to pass through, the wavelength conversion device is suitable for converting the excitation beam into a conversion beam, the conversion beam comprises a specific color beam and a color beam other than the specific color beam, the filter reflective device is suitable for reflecting the specific color beam and absorbing the color beam other than the specific color beam, and the first filter device is suitable for allowing the specific color beam to pass through and reflecting a color beam other than the specific color beam and the excitation beam.
11. The illumination system of claim 10, wherein the wavelength conversion device comprises one or a plurality of wavelength conversion layers, and the plurality of wavelength conversion layers have different or partially overlapped excitation spectrums.
12. The illumination system of claim 11, wherein the wavelength conversion device comprises a first wavelength conversion layer and a second wavelength conversion layer, the second wavelength conversion layer is located between the first wavelength conversion layer and the filter reflective device, and a peak value of the excitation spectrum of the first wavelength conversion layer is less than a peak value of the excitation spectrum of the second wavelength conversion layer.
13. The illumination system of claim 10, wherein the wavelength conversion filter unit further comprises:
- a second filter device disposed between the filter reflective device and the wavelength conversion device, wherein the second filter device is suitable for reflecting the specific color beam and allowing the color beam other than the specific color beam to pass through.
14. The illumination system of claim 10, wherein the filter reflective device comprises a reflective layer and a second filter device, the second filter device is disposed between the reflective layer and the wavelength conversion device, and the second filter device is suitable for reflecting the specific color beam and allowing the color beam other than the specific color beam to pass through.
15. The illumination system of claim 10, wherein the filter reflective device comprises a pigment corresponding to the specific color beam or an absorbent glass powder corresponding to the specific color beam.
16. An illumination system, comprising:
- an excitation light source adapted to provide an excitation beam; and
- a wavelength conversion filter module disposed on a transmission path of the excitation beam and comprising: a carrier having a plurality of optical regions and adapted to move to allow the plurality of optical regions to receive the excitation beam in order, wherein at least one of the plurality of optical regions is a wavelength conversion filter region, and the carrier has an opening overlapped with the wavelength conversion filter region; and a wavelength conversion filter unit located in the wavelength conversion filter region and comprising a filter reflective device, a second filter device, a wavelength conversion device, and a first filter device disposed on the carrier in order, wherein the first filter device is suitable for allowing the excitation beam incident on the wavelength conversion filter unit to pass through, the wavelength conversion device is suitable for converting the excitation beam into a conversion beam, the conversion beam comprises a specific color beam and a color beam other than the specific color beam, the second filter device is suitable for reflecting the specific color beam and allowing the color beam other than the specific color beam to pass through, and the first filter device is suitable for allowing the specific color beam to pass through and reflecting a color beam other than the specific color beam and the excitation beam.
17. The illumination system of claim 16, wherein the wavelength conversion device comprises one or a plurality of wavelength conversion layers, and the plurality of wavelength conversion layers have different or partially overlapped excitation spectrums.
18. The illumination system of claim 17, wherein the wavelength conversion device comprises a first wavelength conversion layer and a second wavelength conversion layer, the second wavelength conversion layer is located between the first wavelength conversion layer and the filter reflective device, and a peak value of the excitation spectrum of the first wavelength conversion layer is less than a peak value of the excitation spectrum of the second wavelength conversion layer.
| 7772534 | August 10, 2010 | Ito |
| 9581879 | February 28, 2017 | Hsieh et al. |
| 10268111 | April 23, 2019 | Ikeda |
| 20110090466 | April 21, 2011 | Chiang |
| 20120075590 | March 29, 2012 | Huang |
| 20120102126 | April 26, 2012 | Murphy et al. |
| 20120243205 | September 27, 2012 | Lin |
| 20130056775 | March 7, 2013 | Kawakami |
| 20130088689 | April 11, 2013 | Lin |
| 20130126930 | May 23, 2013 | Kabuki |
| 20130194644 | August 1, 2013 | Cable et al. |
| 20130258639 | October 3, 2013 | Hu et al. |
| 20140253882 | September 11, 2014 | King et al. |
| 20150002824 | January 1, 2015 | Kasugai et al. |
| 20150098070 | April 9, 2015 | Hsieh |
| 20160252722 | September 1, 2016 | Li |
| 20160363294 | December 15, 2016 | Yu et al. |
| 20170167710 | June 15, 2017 | Wu |
| 20170180686 | June 22, 2017 | Chen |
| 20180108814 | April 19, 2018 | Zheng |
| 20180259834 | September 13, 2018 | Endo |
| 1945511 | April 2007 | CN |
| 101764016 | June 2010 | CN |
| 102103435 | June 2011 | CN |
| 102272953 | December 2011 | CN |
| 102272954 | December 2011 | CN |
| 102298467 | December 2011 | CN |
| 102426403 | April 2012 | CN |
| 102540656 | July 2012 | CN |
| 102720957 | October 2012 | CN |
| 202708991 | January 2013 | CN |
| 103105659 | May 2013 | CN |
| 103116204 | May 2013 | CN |
| 203810292 | September 2014 | CN |
| 103052841 | February 2015 | CN |
| 102289141 | July 2015 | CN |
| 105093776 | November 2015 | CN |
| 103890138 | June 2016 | CN |
| 200722893 | June 2007 | TW |
| 201214009 | April 2012 | TW |
| 201239508 | October 2012 | TW |
| I512385 | December 2015 | TW |
| I515506 | January 2016 | TW |
| 0147285 | June 2001 | WO |
| 2013071742 | May 2013 | WO |
Type: Grant
Filed: Apr 13, 2018
Date of Patent: Nov 19, 2019
Patent Publication Number: 20180314140
Assignee: Coretronic Corporation (Hsin-Chu)
Inventor: Chien-Chung Liao (Hsin-Chu)
Primary Examiner: William N Harris
Application Number: 15/952,243
International Classification: G03B 21/20 (20060101); G03B 33/08 (20060101); G03B 21/16 (20060101);
